[issue15903] Make rawiobase_read() read directly to bytes object

[Antoine Pitrou]

Antoine Pitrou added the comment:

> So I think the combination of PyMemoryView_FromObject() with a call to
> PyMemoryView_Release() should indeed work here.

I don't think we want to expose a mutable bytes object to outside code, so IMO PyMemoryView_FromMemory() is preferrable.

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<http://bugs.python.org/issue15903>
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